sim: Naive move of binding into mcuboot-sys

Create a crate `mcuboot-sys` to hold the building and binding of the
mcuboot code.  There aren't any substantive code changes here, just
moving the code into a separate crate.

Signed-off-by: David Brown <david.brown@linaro.org>
diff --git a/sim/mcuboot-sys/src/lib.rs b/sim/mcuboot-sys/src/lib.rs
new file mode 100644
index 0000000..2da90ef
--- /dev/null
+++ b/sim/mcuboot-sys/src/lib.rs
@@ -0,0 +1,7 @@
+extern crate libc;
+#[macro_use] extern crate log;
+extern crate simflash;
+
+pub mod area;
+pub mod c;
+pub mod api;